DIY: Open Lock
Problem statement
You have an old lock in front of you with four circular wheels. Each wheel has ten slots: '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
. The wheels can rotate freely and wrap around. For example, we can turn '9'
to be '0'
or '0'
to be '9'
. Each move consists of turning one wheel one slot.
Initially, the lock starts at '0000'
, a ...
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